You can be described as supine when you're lying face up — for example, your favorite yoga poses might be the supine ones. Someone who is very passive or lethargic could also be called supine — for instance, someone might be supine in the face of continuous threats and insults.

The adjective supine comes from a Latin word, supinus, which means “thrown backwards” or “inactive.” Whenever a person or animal is lying on its back, belly-up, it is supine. When your hand is open, palm-up, it is also supine. Supine can even describe a person who gives insufficient resistance, or who is lazy and ineffectual. "When Jack refused to object to the landlord’s repeated — and gouging — rent increases, he was supine."

Definitions of supine
  1. adjective
    lying face upward
    synonyms: resupine
    not upright in position or posture
  2. adjective
    offering no resistance
    “"No other colony showed such supine, selfish helplessness in allowing her own border citizens to be mercilessly harried"- Theodore Roosevelt”
    synonyms: resistless, unresisting
    inactive, passive
    lacking in energy or will
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